نتایج جستجو برای: volterras population model
تعداد نتایج: 2697164 فیلتر نتایج به سال:
The Allee effect, or inverse density dependence at low population sizes, could seriously impact preservation and management of biological populations. The mounting evidence for widespread Allee effects has lately inspired theoretical studies of how Allee effects alter population dynamics. However, the recent mathematical models of Allee effects have been missing another important force prevalen...
The paper is an overview of our recent results achieved with different coauthors, concerning several research lines of applied population dynamics we initiated some years ago, and mostly published in 2010. First, based on the classical Leslie population model, a dynamic demographic model including controlled immigration is recalled, and applying the Perron-Frobenius theory of nonnegative matric...
Synthetic populations attempt to capture population dynamics of a geographic region and hence are widely used in large-scale multiagent applications simulating real-world phenomena. However, current synthetic populations are mostly static — individuals are assumed to perform same daily routine every day. My thesis aims at taking the first step towards making it a “live” synthetic population tha...
abstract this paper discusses several commonly used models for strategic marketing¹ including market environmental analysis methods (i.e. swot and pest analysis) and strategic marketing tools and techniques (i.e. boston matrix and shell directional policy matrix)and shows how these models may help a firm to achieve its strategic goals. at first, the main reason for doing this research is de...
in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...
Synthetic populations attempt to capture population dynamics of a geographic region and hence are widely used in large-scale multiagent applications simulating real-world phenomena. However, current synthetic populations are mostly static — individuals are assumed to perform same daily routine every day. My thesis aims at taking the first step towards making it a “live” synthetic population tha...
this paper investigates the dynamics and stability properties of a discrete-time lotka-volterra type system. we first analyze stability of the fixed points and the existence of local bifurcations. our analysis shows the presence of rich variety of local bifurcations, namely, stable fixed points; in which population numbers remain constant, periodic cycles; in which population numbers oscillate amo...
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